Many students simply do not have the information-literacy skills needed to navigate the Web effectively in an open- ended research activity. Teachers often need to direct students to great material and set some boundaries around their exploration of well-chosen sites.
Here are links to two pages about different types of guided inquiry activities, virtual tours and scavenger hunts.
We have a whole page devote to these handy lesson plans. WebQuests guide students through a series of online tasks and activities, and the best of them result in carefully crafted, student-centered projects.